I’m trying out a new circuit in my test chassis. It’s based on the Park LE 1231 and 1273. Park amps were made by Marshall and some shared Marshall circuits and some didn’t. This one didn’t. It has 3 gain stages and a cathodyne PI.
Here are the original schematics.
http://www.chasingtone.com/schematics/PPl25/park_20wt-1231.pdf
http://www.chasingtone.com/schematics/PPl25/park_20wt-1273.pdf
And here is my schematic:
The preamp is pretty close, the PI and output section are a little different as is the power rail. One straight out mod I did was adding a mid boost switch that puts a .001 cap parallel to the treble cap in the tone stack. I think this sounds better for overdriven tones.
I think it sounds pretty good. I’m considering build one with EL84s like the original. With the 250p bright cap on the volume pot its pretty bright at low volume but it’s not as bright as you turn it up.
I did a couple video clips.
This is a Les Paul, the mid boost engaged and going through my 1×12 with a Vintage 30. I’m going for a straight rock sound in this one.
This is one with a strat and then Les Paul going into my 2×12 with a Celestion 70th Anniversary and WGS Retro 30.
Great website. How does this compare to your jcm800 5e3?
I think this sounds great and am going to use this to modify a 6SL7 / 6V6. Not sure about using the 6SL7 for the cathodyne PI, but we’ll find out…
How come this great sounding amp doesn’t show up on the site any more? I found it through a search engine from your “Park” schematic to here.
Thanks for all of this–great site!
Hmmm….you’re right. The 5E3 Park is not showing up on the site menu anymore. I’m not sure what happened with that. I’ll have to add it back in.